Contact your doctor and ask if this is just your body adjusting to the medication or if you need to change medications. Take care....
If you are still having so many symptoms, why go off your meds?
Try waiting until your life situation is stable and supportive and you are feeling well for awhile before stopping your meds.
Yes, discuss with your doctor....
Get well!
You described something that sounds like brain zaps/brain shivers. Effexor is one tough dude to withdraw from. It is very likely to cause severe withdrawal symptoms. You should tapper off slowly if you want to get off this medication to avoid or at least reduce the withdrawal symptoms.
M4